that will include an interview with one of the most vocal conservative opponents of higher taxes, grover norquist. >> woodruff: now, as part of our "agents for change" series, we have an update from earthquake and flood-ravaged haiti. special correspondent fred de sam lazaro reports on the fight against an ongoing cholera epidemic. reporter: the 2010 earthquake that devastated haiti may still loom large in americans' memory but in haiti itself, that was at least three disasters ago. before hurricanes thomas last year, isaac in august and recently sandy. each storm brought a grim reminder of yet one more ever-present disaster: the deadly cholera epidemic that started ten months after the quake. at the cholera ward of saint luke's hospital just outside the capital port-au-prince, this doctor says since hurricane sandy admissions have doubled from 20 to 40 patients each day. >> most of the new cases are coming from further up the hill in places where we had not seen them before. i'm not positive but perhaps the wells there have been contaminated. >> reporter: experts believe cholera was bro